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简介:
273-73-27
=273-(73+27)
=273-100
=173
725-76-24
=725-(76+24)
=725-100
=625
1036-155-245
=1036-(155+245)
=1036-400
=636
871-299
=971-300+1
=671+1
=672
576-285+85
=576-(285-85)
=576-200
=376
748-351+252-149
=(748+252)-(351+149)
=1000-500
=500
(355-140)-(360-245)
=(355+245)-(140+360)
=600-500
=100
6756+193-(756-207)
=(6756-756)+(193+207)
=6000+400
=6400